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BUG: KASAN: out-of-bounds in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: out-of-bounds in atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline]
BUG: KASAN: out-of-bounds in put_bh include/linux/buffer_head.h:320 [inline]
BUG: KASAN: out-of-bounds in end_buffer_read_sync+0xe4/0x190 fs/buffer.c:160
Write of size 4 at addr ffff80002d3b7520 by task ksoftirqd/1/21

CPU: 1 PID: 21 Comm: ksoftirqd/1 Not tainted 6.1.71-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:395
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 __kasan_check_write+0x2c/0x3c mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_dec include/linux/atomic/atomic-instrumented.h:257 [inline]
 put_bh include/linux/buffer_head.h:320 [inline]
 end_buffer_read_sync+0xe4/0x190 fs/buffer.c:160
 end_bio_bh_io_sync+0xb0/0x1e0 fs/buffer.c:2655
 bio_endio+0x7c8/0x80c block/bio.c:1549
 req_bio_endio block/blk-mq.c:763 [inline]
 blk_update_request+0x4ac/0xdf0 block/blk-mq.c:908
 blk_mq_end_request+0x54/0x88 block/blk-mq.c:1035
 lo_complete_rq+0x140/0x258 drivers/block/loop.c:370
 blk_complete_reqs block/blk-mq.c:1113 [inline]
 blk_done_softirq+0x11c/0x168 block/blk-mq.c:1118
 __do_softirq+0x314/0xe38 kernel/softirq.c:571
 run_ksoftirqd+0x68/0x258 kernel/softirq.c:934
 smpboot_thread_fn+0x4b0/0x96c kernel/smpboot.c:164
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

The buggy address belongs to the virtual mapping at
 [ffff80002d3b0000, ffff80002d3b9000) created by:
 copy_process+0x530/0x38d0 kernel/fork.c:2098

The buggy address belongs to the physical page:
page:000000001a8740bc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11adf2
memcg:ffff0000d5fbb902
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff0000d5fbb902
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff80002d3b7400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff80002d3b7480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff80002d3b7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                  ^
 ffff80002d3b7580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff80002d3b7600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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